Epix (Gen 2) will have the new software as Fenix 8 Amoled ?

https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/epix-2/381933/will-the-epix-series-get-an-ui-update-to-the-fenix-8-style

No. Different code base.  Confirmed by Garmin via DC Rainmaker review.

Where is that?

Garmin Fenix 8 In-Depth Review: Worth the Upgrade? | DC Rainmaker

Comment #58

any response from official Garmin-Sierra ??

There won’t be anything officially from Garmin. They’ve not done it in the past. They’re unlikely to do so in the future. Simply put, if you want the new UI buy the new watch. 

And thanks to those forums user replying quickly for the most important scientist test for the communty 

Similar CPU since 2021, based on benchmark results

Please Garmin, do some effort and focus on software quality with only one System for all your watch with active support.

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• Fenix 8 47mm AMOLED | 006-B4536-00 | SW 11.60 | 454x454 | Connect IQ 5.0.1 | CPU 6.4/ 45.5 Pips
  • jsla7527

• Enduro 3 | 006-B4575-00 | SW 11.60 | 280x280 | ciq 5.0.1 | CPU 6.5/  45.5 Pips
  • Sitronen

• Fenix 7 X ss | 006-B3907-00 | SW 18.14beta | 280x280 | ciq 5.0.1 | cpu 6.4/ 45.5 Pips

When Garmin introduced Fenix 5 it was also big change comparing to Fenix 3, now after three models having more than less similar UI they did it again.
It is typical to software release cycle, from time to time it is big bang change and nobody take care to support older solution.|It is how it works and you should use to live with it.

There still will be software fixes and smaller updates to previous models but company will not spend extra money to fully develop od software.